| 摘要 |
A ceramic is disclosed which maintains a high electric resistance over a wide temperature range and has a large temperature coefficient of resistance variation at temperatures just below the aforesaid range, the PTC ceramic consisting essentially of 100 PARTS BY WEIGHT OF FOUR INGREDIENTS INCLUDING A. 1 MOL OF BARIUM TITANATE COMPOSITION, B. 0.003 TO 0.05 MOL OF TITANIA, C. 0.003 TO 0.05 MOL OF ALUMINA, AND D. 0.005 TO 0.06 MOL OF SILICA; 0.05 TO 0.3 PART BY WEIGHT OF E. TANTALUM PENTOXIDE AND/OR ANTIMONY PENTOXIDE; AND 0.005 TO 0.03 PART BY WEIGHT OF F. MANGANESE AND/OR COPPER.
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